--Lauren Faust said that she misses terribly being on the show and, in
answer to a fan question, revealed that she'd be interested in returning
if "conditions were right."

--Meghan McCarthy gave a small
spoiler during the second writers panel that we may find out this season
what's been keeping Luna busy for the past two seasons.

--William
Anderson would love to host a live orchestral performance of selections
from the show score, perhaps at some place like the Staples Center in
LA, though it sounded like there were no actual plans for that; it's
just something he thinks would be neat.

--Both Jayson Theissen
and Weird Al want Weird Al to appear on the show. It's a matter of
working out schedules to make it happen; all parties are willing (again,
this info from Wil Anderson).